android.app.job.JobInfo#NETWORK_BYTES_UNKNOWN源码实例Demo

private long computeEstimatedNetworkBytesLocked() {
    // If any component of the job has unknown usage, we don't have a
    // complete picture of what data will be used, and we have to treat the
    // entire job as unknown.
    long totalNetworkBytes = 0;
    long networkBytes = job.getEstimatedNetworkBytes();
    if (networkBytes == JobInfo.NETWORK_BYTES_UNKNOWN) {
        return JobInfo.NETWORK_BYTES_UNKNOWN;
    } else {
        totalNetworkBytes += networkBytes;
    }
    if (pendingWork != null) {
        for (int i = 0; i < pendingWork.size(); i++) {
            networkBytes = pendingWork.get(i).getEstimatedNetworkBytes();
            if (networkBytes == JobInfo.NETWORK_BYTES_UNKNOWN) {
                return JobInfo.NETWORK_BYTES_UNKNOWN;
            } else {
                totalNetworkBytes += networkBytes;
            }
        }
    }
    return totalNetworkBytes;
}
 

/**
 * Test to see if running the given job on the given network is insane.
 * <p>
 * For example, if a job is trying to send 10MB over a 128Kbps EDGE
 * connection, it would take 10.4 minutes, and has no chance of succeeding
 * before the job times out, so we'd be insane to try running it.
 */
@SuppressWarnings("unused")
private static boolean isInsane(JobStatus jobStatus, Network network,
        NetworkCapabilities capabilities, Constants constants) {
    final long estimatedBytes = jobStatus.getEstimatedNetworkBytes();
    if (estimatedBytes == JobInfo.NETWORK_BYTES_UNKNOWN) {
        // We don't know how large the job is; cross our fingers!
        return false;
    }

    // We don't ask developers to differentiate between upstream/downstream
    // in their size estimates, so test against the slowest link direction.
    final long slowest = NetworkCapabilities.minBandwidth(
            capabilities.getLinkDownstreamBandwidthKbps(),
            capabilities.getLinkUpstreamBandwidthKbps());
    if (slowest == LINK_BANDWIDTH_UNSPECIFIED) {
        // We don't know what the network is like; cross our fingers!
        return false;
    }

    final long estimatedMillis = ((estimatedBytes * DateUtils.SECOND_IN_MILLIS)
            / (slowest * TrafficStats.KB_IN_BYTES / 8));
    if (estimatedMillis > JobServiceContext.EXECUTING_TIMESLICE_MILLIS) {
        // If we'd never finish before the timeout, we'd be insane!
        Slog.w(TAG, "Estimated " + estimatedBytes + " bytes over " + slowest
                + " kbps network would take " + estimatedMillis + "ms; that's insane!");
        return true;
    } else {
        return false;
    }
}